AttributeError：“ str”对象没有属性“ eval”

问题描述

我不断收到该错误：“ AttributeError：'str'对象没有属性'eval'”，有人可以告诉我如何解决它及其含义吗？这是我的代码顺便说一句：

from rply.token import BaseBox


class Loop(BaseBox):
    def __init__(self,number,statementlist):
        self.number = number
        self.statementlist = statementlist

    def eval(self):
        for i in range(self.number):
            self.statementlist.eval()
    @staticmethod
    def gettokentype():
        return 'statement'


class While(BaseBox):
    def __init__(self,condition,statementlist):
        self.condition = condition
        self.statementlist = statementlist

    def eval(self):
        while bool(self.condition.eval()):
            self.statementlist.eval()

    @staticmethod
    def gettokentype():
        return 'statement'

整个错误：

Traceback (most recent call last):
  File "main.py",line 102,in <module>
    parser.parse(tokens)
  File "/opt/virtualenvs/python3/lib/python3.8/site-packages/rply/parser.py",line 49,in parse
    current_state = self._reduce_production(
  File "/opt/virtualenvs/python3/lib/python3.8/site-packages/rply/parser.py",line 80,in _reduce_production
    value = p.func(targ)
  File "/home/runner/RealMotionlessLivedistro/Core/parser.py",line 44,in program
    return p[0].eval()
  File "/home/runner/RealMotionlessLivedistro/Core/AST/Statements.py",line 27,in eval
    i.eval()
  File "/home/runner/RealMotionlessLivedistro/Core/AST/Loops.py",line 25,in eval
    self.statementlist.eval()
  File "/home/runner/RealMotionlessLivedistro/Core/AST/Statements.py",in eval
    i.eval()
  File "/home/runner/RealMotionlessLivedistro/Core/AST/Conditions.py",line 11,in eval
    i.eval()
  File "/home/runner/RealMotionlessLivedistro/Core/AST/Statements.py",line 9,in eval
    self.exp.eval()
  File "/home/runner/RealMotionlessLivedistro/Core/AST/Functions.py",line 55,in eval
    self.value = self.value.eval()
AttributeError: 'str' object has no attribute 'eval'

我们非常感谢您的帮助，请xD

解决方法

如果您正在查看python内置函数eval()，则其用法有所不同。

>>> x = 1
>>> eval('x+1')
2

attributeerror python